GDMO Previous Year Questions related to Circulatory System
If you want to prepare GDMO Previous Year Questions and questions related to the circulatory system to prepare the initial tests in the medical branches of the Army, Navy, and Air Force. By reviewing past questions, applicants gain insight into the types of challenges they may face, particularly in understanding the circulatory system’s role in health and disease. These mcqs are past experiences of GDMO tests and more related ones can me prepared like heart functions, blood vessels, and blood circulation mechanisms, which are frequently tested areas.
These preparations not only equip candidates with the necessary knowledge to tackle related MCQs confidently but also provide a comprehensive understanding that is critical for excelling in the exams and achieving a successful career in the military medical services.
GDMO Previous Year Questions about Circulatory System (Part-01)
Q: Which of the following structures carries oxygenated blood from the lungs to the heart?
A) Pulmonary artery
B) Pulmonary vein
C) Inferior vena cava
D) Aorta
Correct Answer: B) Pulmonary vein
Q: The function of the valve in the heart is to:
A) Regulate blood pressure
B) Prevent the backflow of blood
C) Pump blood into the arteries
D) Stimulate the contraction of the myocardium
Correct Answer: B) Prevent the backflow of blood
Q: Which of the following vessels carries deoxygenated blood back to the heart from the lower body?
A) Pulmonary vein
B) Superior vena cava
C) Inferior vena cava
D) Carotid artery
Correct Answer: C) Inferior vena cava
Q: Which layer of the heart wall is responsible for the contraction of the heart muscle?
A) Endocardium
B) Myocardium
C) Epicardium
D) Pericardium
Correct Answer: B) Myocardium
Q: The normal cardiac output in an adult at rest is approximately:
A) 1-2 L/min
B) 5-6 L/min
C) 10-12 L/min
D) 20-25 L/min
Correct Answer: B) 5-6 L/min
Q: Which of the following blood vessels carries oxygenated blood to the body from the left ventricle?
A) Pulmonary artery
B) Aorta
C) Superior vena cava
D) Jugular vein
Correct Answer: B) Aorta
Q: Which chamber of the heart receives oxygenated blood from the lungs?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Correct Answer: B) Left atrium
Q: Which of the following is the main function of the red blood cells?
A) To fight infection
B) To carry oxygen
C) To form blood clots
D) To transport nutrients
Correct Answer: B) To carry oxygen
Q: The “dub” sound of the heartbeat corresponds to:
A) Closure of the atrioventricular (AV) valves
B) Closure of the semilunar valves
C) Contraction of the atria
D) Contraction of the ventricles
Correct Answer: B) Closure of the semilunar valves
Q: Which of the following is the largest artery in the human body?
A) Pulmonary artery
B) Carotid artery
C) Jugular vein
D) Aorta
Correct Answer: D) Aorta
Q: Which component of the blood is primarily responsible for clotting?
A) Red blood cells
B) White blood cells
C) Platelets
D) Plasma
Correct Answer: C) Platelets
Q: The right side of the heart pumps blood to which circuit?
A) Systemic circulation
B) Pulmonary circulation
C) Coronary circulation
D) Cerebral circulation
Correct Answer: B) Pulmonary circulation
Q: Which of the following vessels carries blood away from the heart?
A) Veins
B) Capillaries
C) Arteries
D) Lymphatic vessels
Correct Answer: C) Arteries
Q: What is the primary role of the atrioventricular (AV) node in the heart?
A) To pump blood to the lungs
B) To initiate electrical impulses for heart contraction
C) To delay the electrical impulse between atria and ventricles
D) To contract the heart muscle
Correct Answer: C) To delay the electrical impulse between atria and ventricles
Q: The blood pressure is highest in which of the following vessels?
A) Capillaries
B) Arterioles
C) Veins
D) Arteries
Correct Answer: D) Arteries
Q: Which of the following is responsible for the exchange of gases, nutrients, and wastes between blood and tissues?
A) Arteries
B) Veins
C) Capillaries
D) Lymphatic vessels
Correct Answer: C) Capillaries
Q: Which of the following best describes the function of the lymphatic system?
A) Transport oxygen to tissues
B) Transport carbon dioxide away from tissues
C) Drain excess fluid and return it to the bloodstream
D) Deliver hormones to target organs
Correct Answer: C) Drain excess fluid and return it to the bloodstream
Q: The heart’s conduction system is responsible for:
A) Stimulating the contraction of the atria and ventricles
B) Secreting hormones that regulate heart rate
C) Carrying oxygen and nutrients to heart cells
D) Storing electrical impulses
Correct Answer: A) Stimulating the contraction of the atria and ventricles
Q: Which of the following blood vessels is responsible for supplying the heart muscle with oxygenated blood?
A) Coronary veins
B) Pulmonary arteries
C) Coronary arteries
D) Jugular veins
Correct Answer: C) Coronary arteries
Q: Which of the following valves separates the right atrium from the right ventricle?
A) Mitral valve
B) Tricuspid valve
C) Aortic valve
D) Pulmonary valve
Correct Answer: B) Tricuspid valve
Q: Which of the following is the main component of plasma in blood?
A) White blood cells
B) Platelets
C) Water
D) Hemoglobin
Correct Answer: C) Water
Q: Which of the following is a characteristic of veins?
A) They have thicker walls than arteries
B) They carry blood away from the heart
C) They have valves to prevent backflow of blood
D) They carry oxygenated blood to the lungs
Correct Answer: C) They have valves to prevent backflow of blood
Q: What is the function of the lymph nodes in the lymphatic system?
A) To pump lymph into the bloodstream
B) To filter and trap pathogens from the lymph
C) To produce red blood cells
D) To store platelets
Correct Answer: B) To filter and trap pathogens from the lymph
Q: Which of the following arteries supplies the brain with oxygenated blood?
A) Carotid artery
B) Pulmonary artery
C) Coronary artery
D) Subclavian artery
Correct Answer: A) Carotid artery
Q: The function of the pulmonary circulation is to:
A) Deliver oxygenated blood to the body
B) Carry deoxygenated blood from the heart to the lungs for oxygenation
C) Transport nutrients from the digestive system to the cells
D) Return blood from the organs to the heart
Correct Answer: B) Carry deoxygenated blood from the heart to the lungs for oxygenation
Q: Which of the following best describes the structure of capillaries?
A) Large vessels with thick walls
B) Thin-walled vessels where exchange of gases and nutrients occurs
C) Thick-walled vessels that carry blood away from the heart
D) Blood vessels with valves to prevent backflow
Correct Answer: B) Thin-walled vessels where exchange of gases and nutrients occurs
Q: Which blood vessel carries oxygenated blood from the lungs to the heart?
A) Pulmonary vein
B) Pulmonary artery
C) Inferior vena cava
D) Aorta
Correct Answer: A) Pulmonary vein
Q: Which of the following is the correct order of blood flow through the heart?
A) Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta
B) Left atrium → Left ventricle → Pulmonary artery → Right atrium → Right ventricle → Lungs → Aorta
C) Right atrium → Left atrium → Pulmonary artery → Right ventricle → Left ventricle → Aorta
D) Left atrium → Right atrium → Pulmonary vein → Left ventricle → Aorta
Correct Answer: A) Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta
GDMO Previous Year Questions about Circulatory System (Part-02)
Q: Which type of blood vessel has the thickest walls to withstand high pressure?
A) Veins
B) Capillaries
C) Arteries
D) Lymphatic vessels
Correct Answer: C) Arteries
Q: What is the function of the sinoatrial (SA) node in the heart?
A) It contracts the heart muscle
B) It generates electrical impulses to initiate heartbeats
C) It prevents backflow of blood into the atria
D) It stores blood for later use
Correct Answer: B) It generates electrical impulses to initiate heartbeats
Q: Which of the following conditions occurs when the blood pressure in the arteries is consistently high?
A) Hypotension
B) Hypertension
C) Arrhythmia
D) Anemia
Correct Answer: B) Hypertension
Q: What type of blood vessel carries blood to the lungs for oxygenation?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Superior vena cava
Correct Answer: A) Pulmonary artery
Q: The coronary arteries supply oxygenated blood to which part of the body?
A) Brain
B) Lungs
C) Heart muscle
D) Liver
Correct Answer: C) Heart muscle
Q: Which component of blood is primarily responsible for transporting oxygen to tissues?
A) Plasma
B) White blood cells
C) Red blood cells
D) Platelets
Correct Answer: C) Red blood cells
Q: Which of the following describes the role of the atrioventricular (AV) valves in the heart?
A) They prevent the backflow of blood into the atria during ventricular contraction
B) They carry oxygenated blood from the lungs to the heart
C) They control the rate of electrical impulses in the heart
D) They prevent the backflow of blood from the ventricles to the atria
Correct Answer: A) They prevent the backflow of blood into the atria during ventricular contraction
Q: Which of the following statements about the aorta is correct?
A) It carries deoxygenated blood from the heart to the lungs
B) It is the largest vein in the body
C) It carries oxygenated blood from the left ventricle to the body
D) It connects the right atrium to the left ventricle
Correct Answer: C) It carries oxygenated blood from the left ventricle to the body
Q: What is the primary role of the venous valves in the circulatory system?
A) To transport oxygenated blood
B) To prevent the backflow of blood in veins
C) To contract and propel blood
D) To regulate blood pressure
Correct Answer: B) To prevent the backflow of blood in veins
Q: Which of the following vessels carries deoxygenated blood from the head and upper body to the heart?
A) Pulmonary artery
B) Inferior vena cava
C) Carotid artery
D) Superior vena cava
Correct Answer: D) Superior vena cava
Q: Which heart valve prevents blood from flowing back into the left ventricle?
A) Tricuspid valve
B) Pulmonary valve
C) Aortic valve
D) Mitral valve
Correct Answer: C) Aortic valve
Q: Which of the following is the primary function of the cardiovascular system?
A) Regulating body temperature
B) Transmitting nerve signals
C) Delivering oxygen and nutrients to tissues and removing waste
D) Regulating the body’s immune response
Correct Answer: C) Delivering oxygen and nutrients to tissues and removing waste
Q: Which of the following is true regarding the structure of arteries?
A) They have thinner walls than veins
B) They have valves to prevent backflow of blood
C) They carry blood away from the heart
D) They are made of a single layer of endothelial cells
Correct Answer: C) They carry blood away from the heart
Q: The primary function of the pulmonary circulation is to:
A) Transport oxygenated blood to the lungs
B) Transport deoxygenated blood to the lungs for oxygenation
C) Carry oxygenated blood from the heart to the body
D) Deliver nutrients and hormones to the tissues
Correct Answer: B) Transport deoxygenated blood to the lungs for oxygenation
Q: What is the term for the blood vessels that connect arterioles and venules and facilitate the exchange of gases, nutrients, and waste products?
A) Arteries
B) Capillaries
C) Veins
D) Lymphatic vessels
Correct Answer: B) Capillaries
Q: Which of the following is true about the function of the left ventricle?
A) It pumps deoxygenated blood to the lungs
B) It pumps oxygenated blood to the body
C) It pumps deoxygenated blood to the body
D) It receives oxygenated blood from the lungs
Correct Answer: B) It pumps oxygenated blood to the body
Q: Which of the following vessels carries oxygenated blood from the lungs to the heart?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Jugular vein
Correct Answer: B) Pulmonary vein
Q: Which of the following is a characteristic of veins?
A) They carry oxygenated blood to the heart
B) They have thick muscular walls to withstand high pressure
C) They carry blood away from the heart
D) They transport blood under high pressure
Correct Answer: A) They carry oxygenated blood to the heart
Q: Which of the following heart valves prevents blood from flowing back into the left atrium after it enters the left ventricle?
A) Tricuspid valve
B) Aortic valve
C) Mitral valve
D) Pulmonary valve
Correct Answer: C) Mitral valve
Q: Which blood vessel carries oxygenated blood from the heart to the upper part of the body?
A) Pulmonary artery
B) Aorta
C) Jugular vein
D) Carotid artery
Correct Answer: B) Aorta
Q: The rhythmic contraction and relaxation of the heart muscle is regulated by which of the following?
A) Neural impulses only
B) Electrical impulses initiated by the sinoatrial (SA) node
C) Hormones released by the adrenal glands
D) Mechanical stimulation from the veins
Correct Answer: B) Electrical impulses initiated by the sinoatrial (SA) node
Q: Which of the following components of blood is responsible for clotting?
A) Plasma
B) White blood cells
C) Platelets
D) Red blood cells
Correct Answer: C) Platelets
Q: Which of the following is a feature of the heart’s conduction system?
A) It is regulated entirely by the sympathetic nervous system
B) It requires input from the brain to initiate each heartbeat
C) It generates electrical impulses to coordinate heart contraction
D) It transports blood throughout the body
Correct Answer: C) It generates electrical impulses to coordinate heart contraction
Q: The “lub” sound of the heartbeat corresponds to:
A) Closure of the semilunar valves
B) Contraction of the atria
C) Closure of the atrioventricular (AV) valves
D) Contraction of the ventricles
Correct Answer: C) Closure of the atrioventricular (AV) valves
Q: Which of the following best describes the structure of the heart’s myocardium?
A) It is a thin layer of epithelial cells that line the heart chambers
B) It is a layer of smooth muscle that allows for expansion and contraction
C) It is a thick muscular layer responsible for the contraction of the heart
D) It is a fibrous layer that provides structural support
Correct Answer: C) It is a thick muscular layer responsible for the contraction of the heart
Q: What is the primary function of the right side of the heart?
A) To pump oxygenated blood to the body
B) To pump deoxygenated blood to the lungs
C) To pump oxygenated blood to the heart muscle
D) To pump oxygenated blood to the brain
Correct Answer: B) To pump deoxygenated blood to the lungs
Q: Which blood vessels are primarily responsible for regulating blood pressure and blood flow to organs?
A) Arteries
B) Veins
C) Capillaries
D) Arterioles
Correct Answer: D) Arterioles
GDMO Previous Year Questions about Circulatory System (Part-03)
Q: Which of the following is a function of the lymphatic system in relation to the circulatory system?
A) It regulates the pH of blood
B) It transports excess interstitial fluid back into the bloodstream
C) It delivers oxygen to the tissues
D) It absorbs glucose and other nutrients
Correct Answer: B) It transports excess interstitial fluid back into the bloodstream
Q: Which of the following is true regarding the function of the superior vena cava?
A) It carries oxygenated blood to the heart from the lungs
B) It transports deoxygenated blood from the lower body to the heart
C) It transports deoxygenated blood from the upper body to the heart
D) It carries oxygenated blood from the lungs to the left atrium
Correct Answer: C) It transports deoxygenated blood from the upper body to the heart
Q: Which of the following describes the role of erythrocytes (red blood cells)?
A) They fight infections and produce antibodies
B) They transport oxygen to the tissues and remove carbon dioxide
C) They initiate the clotting process in blood
D) They carry nutrients and hormones throughout the body
Correct Answer: B) They transport oxygen to the tissues and remove carbon dioxide
Q: The exchange of gases (oxygen and carbon dioxide) in the lungs occurs in which part of the circulatory system?
A) Veins
B) Arteries
C) Capillaries
D) Lymphatic vessels
Correct Answer: C) Capillaries
Q: Which of the following is a characteristic of the blood in the pulmonary veins?
A) Deoxygenated blood
B) Oxygenated blood
C) Blood with high carbon dioxide levels
D) Blood with low oxygen levels
Correct Answer: B) Oxygenated blood
Q: What is the primary role of the coronary veins in the circulatory system?
A) To carry oxygenated blood to the heart
B) To carry deoxygenated blood away from the heart muscle
C) To deliver oxygen and nutrients to the brain
D) To regulate blood flow in the arteries
Correct Answer: B) To carry deoxygenated blood away from the heart muscle
Q: Which of the following describes the correct sequence of blood flow through the heart?
A) Left atrium → Left ventricle → Right atrium → Right ventricle
B) Right atrium → Right ventricle → Left atrium → Left ventricle
C) Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle
D) Left atrium → Right atrium → Left ventricle → Right ventricle
Correct Answer: C) Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle
Q: Which of the following is NOT a type of white blood cell?
A) Eosinophil
B) Neutrophil
C) Lymphocyte
D) Erythrocyte
Correct Answer: D) Erythrocyte
Q: Which blood vessel is responsible for carrying oxygen-rich blood from the heart to the body?
A) Pulmonary vein
B) Pulmonary artery
C) Aorta
D) Jugular vein
Correct Answer: C) Aorta
Q: Which of the following is the primary function of platelets in blood?
A) Carrying oxygen to tissues
B) Fighting infection
C) Blood clotting
D) Transporting nutrients
Correct Answer: C) Blood clotting
Q: Which part of the brain is primarily responsible for regulating heart rate?
A) Cerebellum
B) Medulla oblongata
C) Hippocampus
D) Thalamus
Correct Answer: B) Medulla oblongata
Q: Which of the following is the most important characteristic of veins?
A) They have thin walls and carry blood away from the heart
B) They have thick muscular walls and carry oxygenated blood
C) They have one-way valves to prevent backflow of blood
D) They are the site of gas exchange
Correct Answer: C) They have one-way valves to prevent backflow of blood
Q: Which of the following is the first event in the cardiac cycle?
A) Contraction of the ventricles
B) Atrial contraction
C) Relaxation of the ventricles
D) Opening of the aortic valve
Correct Answer: B) Atrial contraction
Q: What is the term for the volume of blood pumped by the heart per minute?
A) Stroke volume
B) Cardiac output
C) Blood pressure
D) Heart rate
Correct Answer: B) Cardiac output
Q: Which part of the heart receives deoxygenated blood from the body?
A) Left atrium
B) Right atrium
C) Left ventricle
D) Right ventricle
Correct Answer: B) Right atrium
Q: The exchange of nutrients, gases, and waste products between the blood and tissues occurs in which blood vessels?
A) Arteries
B) Capillaries
C) Venules
D) Lymphatic vessels
Correct Answer: B) Capillaries
Q: Which of the following is true regarding the aortic valve?
A) It prevents blood from flowing from the left atrium into the left ventricle
B) It prevents backflow of blood into the left ventricle from the aorta
C) It separates the right atrium and right ventricle
D) It prevents the backflow of blood into the lungs
Correct Answer: B) It prevents backflow of blood into the left ventricle from the aorta
Q: The blood pressure is typically the highest in which type of blood vessels?
A) Capillaries
B) Veins
C) Arteries
D) Lymphatic vessels
Correct Answer: C) Arteries
Q: Which of the following best describes the function of the right ventricle?
A) It pumps oxygenated blood to the body
B) It pumps deoxygenated blood to the lungs
C) It receives oxygenated blood from the lungs
D) It pumps blood to the left atrium
Correct Answer: B) It pumps deoxygenated blood to the lungs
Q: Which of the following structures is responsible for maintaining one-way blood flow in veins?
A) Arterioles
B) Venous valves
C) Capillaries
D) Myocardium
Correct Answer: B) Venous valves
Q: Which chamber of the heart pumps oxygenated blood to the rest of the body?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Correct Answer: D) Left ventricle
Q: What type of muscle tissue is found in the heart?
A) Skeletal muscle
B) Smooth muscle
C) Cardiac muscle
D) Epithelial tissue
Correct Answer: C) Cardiac muscle
Q: Which of the following is responsible for regulating blood flow during exercise?
A) Decreased heart rate
B) Increased parasympathetic activity
C) Increased sympathetic activity
D) Vasoconstriction in the veins
Correct Answer: C) Increased sympathetic activity
Q: Which of the following blood vessels carries blood from the heart to the lungs for oxygenation?
A) Pulmonary artery
B) Pulmonary vein
C) Inferior vena cava
D) Aorta
Correct Answer: A) Pulmonary artery
Q: What is the function of the valve in veins?
A) To allow blood flow in both directions
B) To regulate blood pressure
C) To prevent the backflow of blood
D) To increase the blood flow to the heart
Correct Answer: C) To prevent the backflow of blood
GDMO Previous Year Questions about Circulatory System (Part-04)
Q: Which blood vessels are primarily involved in the exchange of gases, nutrients, and waste products between blood and tissues?
A) Arteries
B) Veins
C) Capillaries
D) Arterioles
Correct Answer: C) Capillaries
Q: What is the role of the semilunar valves in the heart?
A) To prevent backflow of blood from the ventricles into the atria
B) To prevent backflow of blood from the arteries into the ventricles
C) To control the contraction of the heart muscle
D) To regulate the flow of oxygenated blood into the heart
Correct Answer: B) To prevent backflow of blood from the arteries into the ventricles
Q: Which structure prevents the backflow of blood into the right atrium?
A) Mitral valve
B) Tricuspid valve
C) Aortic valve
D) Pulmonary valve
Correct Answer: B) Tricuspid valve
Q: Which of the following is NOT a function of blood plasma?
A) Transport of nutrients
B) Oxygen delivery to tissues
C) Transport of hormones
D) Regulation of body temperature
Correct Answer: B) Oxygen delivery to tissues
Q: Which of the following components of the circulatory system is responsible for carrying oxygenated blood from the lungs to the heart?
A) Pulmonary vein
B) Pulmonary artery
C) Aorta
D) Coronary artery
Correct Answer: A) Pulmonary vein
Q: Which part of the brain controls the involuntary regulation of heart rate?
A) Cerebellum
B) Medulla oblongata
C) Hypothalamus
D) Frontal cortex
Correct Answer: B) Medulla oblongata
Q: Which of the following is a major function of erythrocytes (red blood cells)?
A) Transporting oxygen
B) Immune defense
C) Blood clotting
D) Hormone secretion
Correct Answer: A) Transporting oxygen
Q: Which of the following is true about the aortic arch?
A) It carries deoxygenated blood from the heart to the lungs
B) It branches into the left and right pulmonary arteries
C) It delivers oxygenated blood from the left ventricle to the body
D) It transports deoxygenated blood to the right atrium
Correct Answer: C) It delivers oxygenated blood from the left ventricle to the body
Q: What is the role of the AV (atrioventricular) node in the heart?
A) To initiate the contraction of the heart
B) To slow down the electrical signal between the atria and ventricles
C) To prevent backflow of blood in the ventricles
D) To pump blood to the lungs and body
Correct Answer: B) To slow down the electrical signal between the atria and ventricles
Q: Which of the following structures is responsible for the formation of blood clots?
A) White blood cells
B) Platelets
C) Red blood cells
D) Plasma proteins
Correct Answer: B) Platelets
Q: Which type of blood vessel is responsible for carrying blood under high pressure away from the heart?
A) Capillaries
B) Veins
C) Arteries
D) Lymphatic vessels
Correct Answer: C) Arteries
Q: Which of the following is true regarding the function of the left atrium?
A) It pumps deoxygenated blood to the lungs
B) It receives oxygenated blood from the lungs
C) It pumps oxygenated blood to the body
D) It receives deoxygenated blood from the body
Correct Answer: B) It receives oxygenated blood from the lungs
Q: Which type of blood vessel carries deoxygenated blood back to the heart from the body?
A) Pulmonary artery
B) Aorta
C) Inferior vena cava
D) Coronary artery
Correct Answer: C) Inferior vena cava
Q: What is the effect of the sympathetic nervous system on the heart rate?
A) It decreases the heart rate
B) It increases the heart rate
C) It has no effect on the heart rate
D) It slows down the conduction of electrical impulses in the heart
Correct Answer: B) It increases the heart rate
Q: Which of the following is a characteristic of veins?
A) They have thick muscular walls to withstand high pressure
B) They carry blood under low pressure back to the heart
C) They carry oxygenated blood from the heart to the body
D) They are the site of nutrient and gas exchange
Correct Answer: B) They carry blood under low pressure back to the heart
Q: The heart’s electrical impulses are generated by the:
A) AV node
B) Sinoatrial (SA) node
C) Bundle of His
D) Purkinje fibers
Correct Answer: B) Sinoatrial (SA) node
Q: Which of the following is a function of the lymphatic system that is closely related to the circulatory system?
A) Production of red blood cells
B) Filtration and removal of excess fluid from tissues
C) Transport of oxygen to tissues
D) Regulation of body temperature
Correct Answer: B) Filtration and removal of excess fluid from tissues
Q: Which of the following vessels carries oxygenated blood from the left ventricle to the body?
A) Pulmonary artery
B) Aorta
C) Pulmonary vein
D) Jugular vein
Correct Answer: B) Aorta
Q: Which of the following is responsible for the contraction of the heart muscle?
A) Electrical impulses from the sinoatrial (SA) node
B) Hormones released by the adrenal glands
C) Nerve signals from the brain
D) Oxygen delivered to the heart muscle
Correct Answer: A) Electrical impulses from the sinoatrial (SA) node
Q: What is the primary function of the left atrium?
A) To pump oxygenated blood to the body
B) To receive deoxygenated blood from the lungs
C) To receive oxygenated blood from the lungs
D) To pump deoxygenated blood to the lungs
Correct Answer: C) To receive oxygenated blood from the lungs
Q: Which of the following vessels carries oxygenated blood from the lungs to the heart?
A) Pulmonary artery
B) Pulmonary vein
C) Inferior vena cava
D) Aorta
Correct Answer: B) Pulmonary vein
Q: Which of the following is a characteristic of the walls of arteries?
A) Thin walls with one-way valves
B) Thick muscular walls to withstand high pressure
C) Thin walls that allow for nutrient exchange
D) Elastic walls that only carry deoxygenated blood
Correct Answer: B) Thick muscular walls to withstand high pressure
Q: The largest artery in the body is the:
A) Pulmonary artery
B) Jugular vein
C) Aorta
D) Carotid artery
Correct Answer: C) Aorta
Q: Which of the following is true about the function of the right ventricle?
A) It pumps oxygenated blood to the body
B) It pumps deoxygenated blood to the lungs
C) It pumps oxygenated blood to the lungs
D) It pumps deoxygenated blood to the body
Correct Answer: B) It pumps deoxygenated blood to the lungs
Q: Which of the following is true regarding the coronary arteries?
A) They supply oxygen-rich blood to the heart muscle
B) They carry deoxygenated blood from the heart muscle
C) They deliver nutrients to the brain
D) They carry blood from the body back to the heart
Correct Answer: A) They supply oxygen-rich blood to the heart muscle
Q: The “dub” sound of the heartbeat corresponds to:
A) Closure of the atrioventricular (AV) valves
B) Contraction of the ventricles
C) Closure of the semilunar valves
D) Relaxation of the atria
Correct Answer: C) Closure of the semilunar valves
Q: Which of the following blood components is primarily responsible for immune response?
A) Platelets
B) White blood cells
C) Red blood cells
D) Plasma proteins
Correct Answer: B) White blood cells
Q: Which of the following arteries supplies blood to the brain?
A) Carotid artery
B) Femoral artery
C) Renal artery
D) Subclavian artery
Correct Answer: A) Carotid artery
Q: Which type of blood vessel has the largest diameter and the thinnest walls?
A) Arteries
B) Veins
C) Capillaries
D) Venules
Correct Answer: B) Veins
Q: Which structure prevents the backflow of blood from the right ventricle into the right atrium?
A) Pulmonary valve
B) Aortic valve
C) Tricuspid valve
D) Mitral valve
Correct Answer: C) Tricuspid valve
Q: The movement of blood from the right atrium to the right ventricle is controlled by which valve?
A) Mitral valve
B) Pulmonary valve
C) Tricuspid valve
D) Aortic valve
Correct Answer: C) Tricuspid valve
Q: Which of the following blood vessels carries oxygenated blood to the brain?
A) Jugular vein
B) Pulmonary artery
C) Carotid artery
D) Subclavian vein
Correct Answer: C) Carotid artery
Q: Which type of muscle tissue is found in the walls of blood vessels?
A) Skeletal muscle
B) Cardiac muscle
C) Smooth muscle
D) Epithelial tissue
Correct Answer: C) Smooth muscle
Q: The main function of the cardiovascular system is to:
A) Regulate body temperature
B) Transport oxygen and nutrients to tissues
C) Facilitate the immune response
D) Store energy
Correct Answer: B) Transport oxygen and nutrients to tissues
Q: Which of the following is true about the function of the right atrium?
A) It receives oxygenated blood from the body
B) It pumps deoxygenated blood to the lungs
C) It receives deoxygenated blood from the body
D) It pumps oxygenated blood to the body
Correct Answer: C) It receives deoxygenated blood from the body
GDMO Previous Year Questions about Circulatory System (Part-05)
Q: Which of the following is a characteristic of capillaries?
A) They are the largest blood vessels
B) They are the site of nutrient and gas exchange
C) They carry oxygenated blood only
D) They have thick muscular walls
Correct Answer: B) They are the site of nutrient and gas exchange
Q: The primary function of the semilunar valves is to:
A) Prevent blood from flowing from the ventricles into the atria
B) Prevent backflow of blood into the ventricles from the arteries
C) Prevent blood from entering the heart
D) Regulate blood pressure
Correct Answer: B) Prevent backflow of blood into the ventricles from the arteries
Q: Which of the following is true about the function of the aorta?
A) It carries deoxygenated blood from the body to the heart
B) It carries oxygenated blood from the left ventricle to the body
C) It carries deoxygenated blood from the right atrium to the right ventricle
D) It carries oxygenated blood from the lungs to the heart
Correct Answer: B) It carries oxygenated blood from the left ventricle to the body
Q: Which of the following describes the function of the pulmonary circulation?
A) Carries deoxygenated blood from the heart to the lungs for oxygenation
B) Carries oxygenated blood from the heart to the body
C) Carries deoxygenated blood from the heart to the body
D) Carries oxygenated blood from the lungs to the heart
Correct Answer: A) Carries deoxygenated blood from the heart to the lungs for oxygenation
Q: Which component of the blood is responsible for transporting oxygen to tissues?
A) Plasma
B) Platelets
C) White blood cells
D) Red blood cells
Correct Answer: D) Red blood cells
Q: The contraction of the ventricles is called:
A) Systole
B) Diastole
C) Relaxation
D) Depolarization
Correct Answer: A) Systole
Q: What is the primary function of the valves in the heart?
A) To regulate blood flow
B) To prevent blood from flowing backward
C) To control the blood pressure
D) To maintain a constant heart rate
Correct Answer: B) To prevent blood from flowing backward
Q: Which of the following arteries carries oxygenated blood from the left ventricle to the entire body?
A) Pulmonary artery
B) Aorta
C) Carotid artery
D) Subclavian artery
Correct Answer: B) Aorta
Q: What is the main function of the venous system?
A) To carry oxygenated blood from the heart to the body
B) To transport deoxygenated blood back to the heart
C) To distribute nutrients and hormones to the tissues
D) To perform gas exchange with the lungs
Correct Answer: B) To transport deoxygenated blood back to the heart
Q: Which of the following is the largest vein in the human body?
A) Jugular vein
B) Pulmonary vein
C) Inferior vena cava
D) Renal vein
Correct Answer: C) Inferior vena cava
Q: What is the function of the coronary veins?
A) To supply oxygenated blood to the heart muscle
B) To drain deoxygenated blood from the heart muscle
C) To carry oxygenated blood to the brain
D) To carry deoxygenated blood to the lungs
Correct Answer: B) To drain deoxygenated blood from the heart muscle
Q: What type of blood cell is primarily involved in the clotting process?
A) Erythrocytes
B) Platelets
C) Leukocytes
D) Plasma cells
Correct Answer: B) Platelets
Q: Which heart valve separates the left atrium from the left ventricle?
A) Tricuspid valve
B) Pulmonary valve
C) Mitral valve
D) Aortic valve
Correct Answer: C) Mitral valve
Q: Which part of the circulatory system is responsible for gas exchange in the lungs?
A) Pulmonary arteries
B) Pulmonary veins
C) Capillaries
D) Alveoli
Correct Answer: D) Alveoli
Q: Which blood vessels carry oxygenated blood from the lungs to the heart?
A) Pulmonary veins
B) Pulmonary arteries
C) Jugular veins
D) Coronary arteries
Correct Answer: A) Pulmonary veins
Q: What happens during diastole?
A) The heart muscles contract and pump blood
B) The atria and ventricles relax and fill with blood
C) Blood is pumped into the lungs
D) Blood is pumped into the aorta
Correct Answer: B) The atria and ventricles relax and fill with blood
Q: Which of the following valves prevents the backflow of blood into the left ventricle?
A) Pulmonary valve
B) Mitral valve
C) Aortic valve
D) Tricuspid valve
Correct Answer: C) Aortic valve
Q: What is the primary function of the lymphatic system in relation to the circulatory system?
A) To filter excess fluid from the bloodstream
B) To produce red blood cells
C) To transport oxygen to tissues
D) To regulate blood pressure
Correct Answer: A) To filter excess fluid from the bloodstream
Q: Which of the following is responsible for the initiation of the electrical impulses in the heart?
A) Atrioventricular (AV) node
B) Bundle of His
C) Sinoatrial (SA) node
D) Purkinje fibers
Correct Answer: C) Sinoatrial (SA) node
Q: Which type of blood vessel has the thinnest walls and is the site for nutrient and gas exchange?
A) Arteries
B) Veins
C) Capillaries
D) Arterioles
Correct Answer: C) Capillaries
Q: Which of the following is a function of the plasma in the blood?
A) Clotting of blood
B) Fighting infections
C) Carrying oxygen to tissues
D) Transporting nutrients and waste products
Correct Answer: D) Transporting nutrients and waste products
Q: What is the main difference between arteries and veins?
A) Arteries carry oxygenated blood, while veins carry deoxygenated blood
B) Arteries carry deoxygenated blood, while veins carry oxygenated blood
C) Arteries have thin walls, while veins have thick walls
D) Arteries carry blood only to the lungs, while veins carry blood to the body
Correct Answer: A) Arteries carry oxygenated blood, while veins carry deoxygenated blood
Q: What is the term for the amount of blood the heart pumps per minute?
A) Stroke volume
B) Cardiac output
C) Heart rate
D) Cardiac reserve
Correct Answer: B) Cardiac output
Join Social Media Links for Free Guidance about GDMO Past Tests
Kinetic Intelligence 2026
Sync your mental nodes for the 2026 screening. Access verified Verbal and Non-Verbal reasoning banks for Pakistan Army, Navy, and PAF officer selection.
Army Navy PAF Success Hub
The 2026 high-stability core for military preparation. Download node-verified PDF past papers and master ISSB and Cadet College entrance exams with kinetic focus.
Career Matrix & Experience
You May Like More Tests MCQs for Initial Tests of Forces Jobs
